| 摘要 |
An optical disc comprises indicator means for indicating to a user the state of degradation of the optical disc. For example, the indicator means can be an indicator layer that is configured to change colour when incorporated into an optical disc, thereby providing an indication that the disc is degrading or ageing, and that it is advisable to transfer the data to another storage medium. According to one embodiment, an optical disc 1, for example a DVD, comprises: a label layer 3; a polycarbonate layer 5; an aluminium/silver layer 7; a dye and data layer 9; an adhesive layer 11; and a second polycarbonate layer 13. In addition, the optical disc 1 comprises indicator means in the form of an indicator layer 15. The indicator layer 15 provides an indication to a user about the state of degradation of the optical disc. The indicator layer 15 is arranged such that at least a portion of the indicator layer 15 coincides with the area in which the data layer 9 is located, and configured such that the indicator layer 15 does not interfere with the normal reading and/or writing of data to the data layer 9.
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